#666C5E

#666C5E

Color Values

HEX

#666C5E

RGB

102, 108, 94

HSL

85.7, 6.9%, 39.6%

HSV

85.7, 13.0%, 42.4%

CMYK

5.6%, 0.0%, 13.0%, 57.6%

OKLCH

0.5218 0.0227 126.1

Properties

Cool Dark Nearest: RAL 7023 Concrete Grey

Color Harmonies

Complementary

#666C5E

#645E6C

Analogous

#6C6B5E

#5F6C5E

#666C5E

Triadic

#666C5E

#5E666C

#6C5E66

Split Complementary

#666C5E

#5E5F6C

#6B5E6C

Tetradic

#666C5E

#5E6C6B

#645E6C

#6C5E5F

Color Blindness Simulation

Original

#666C5E

Protanopia

#696961

Deuteranopia

#686862

Tritanopia

#666465

Achromatopsia

#6A6A6A

CSS Usage

background-color: #666C5E;
color: #666C5E;
border-color: #666C5E;
Nearest Tailwind: Stone 500 #78716C

Tailwind Shades

50
#F7F8F7
100
#EDEEEC
200
#DCDED9
300
#C2C6BE
400
#A2A79A
500
#818877
600
#676D5F
700
#52574C
800
#40443B
900
#31332D
950
#1F211D

Contrast Checker

Text on white

5.42:1

AA Pass AAA Fail

Text on black

3.87:1

AA Fail AAA Fail

Related Articles

Tutorials

CSS color-mix(): Blend Colors Natively in the Browser

Jan 26, 2026
Tutorials

Building a Color Picker Web Component from Scratch

Jan 21, 2026
Tutorials

Perceptual Color Spaces: Lab, LCH, Oklab, OKLCH

Jan 15, 2026